1. Go to myetherwallet.com.

2. Choose the language on top right of the page.

3. Then enter the private key to Select Your Wallet File, enter the password. Click Unlock and get to your account.

To log into the wallet again click Send Ether & Tokens in the menu

4. Send ETH 

- Enter the address you would like to send to in the "To Address:" field.

- Enter the amount you would like to send.

  "You can also click the "Send Entire Balance" link if you would like the transfer the entire balance."

5. Click "Generate Transaction".
+ A couple more fields will appear. This is your browser generating the transaction.
+ Click the blue "Send Transaction" button below that.

6. A pop-up will appear. Double-check the amount, type of coin, and the address are correct.
Click "Yes, I am sure! Make transaction." button.

The transaction will be submitted. The TX Hash will display. You can click that TX ID to see it on the blockchain.